Solid-state lamps with omnidirectional emission patterns
First Claim
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1. A lamp comprising:
- a thermally conductive body;
at least one solid-state excitation source mounted in thermal communication with the body;
a photoluminescence component containing a photoluminescence material, wherein the component is hollow and encloses the at least one excitation source; and
a light transmissive cover containing a light diffusive material,wherein the cover encloses the photoluminescence component and comprises a plurality of areas having different diffusivities,wherein the plurality of areas comprises a first area and a second area, and the first area corresponds to a first diffusivity and the second area corresponds to a second diffusivity, andwherein the first diffusivity is different from the second diffusivity.
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Abstract
An inventive LED-based lamp, lamp cover component, and methods for manufacturing thereof are disclosed which provides a light diffusive lamp cover having a diffusivity (transmittance) that is different for different areas (zones or regions) of the cover. The diffusivity and location of those areas are configured so that the emission pattern of the whole lamp meets desired emissions characteristics and optical efficiency levels. The diffusive cover may have any number of specifically delineated diffusivity areas. Alternatively, the cover may provide a gradient of increasing/decreasing diffusivity portions over the cover.
108 Citations
20 Claims
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1. A lamp comprising:
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a thermally conductive body; at least one solid-state excitation source mounted in thermal communication with the body; a photoluminescence component containing a photoluminescence material, wherein the component is hollow and encloses the at least one excitation source; and a light transmissive cover containing a light diffusive material, wherein the cover encloses the photoluminescence component and comprises a plurality of areas having different diffusivities, wherein the plurality of areas comprises a first area and a second area, and the first area corresponds to a first diffusivity and the second area corresponds to a second diffusivity, and wherein the first diffusivity is different from the second diffusivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A lamp comprising:
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a thermally conductive body; at least one solid-state excitation source mounted in thermal communication with the body; a photoluminescence component containing a photoluminescence material, wherein the component is hollow and encloses the at least one excitation source; and a light transmissive cover containing a light diffusive material, wherein the cover encloses the photoluminescence component and diffusivity of the cover is greatest at the top of the cover and decreases towards the bottom of the cover. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification